Federal data show Delta’s transatlantic routes are running near capacity — JFK-Prague topped 94%, eight of 10 most-loaded routes head to Europe, and competition from American Airlines is about to intensify.
Delta Air Lines’ flights to Europe are filling at near-record rates, with eight of the carrier’s 10 most-loaded long-haul routes serving European destinations and its busiest single link — New York’s John F. Kennedy International Airport to Prague — reaching a 94.1% load factor, according to U.S. Department of Transportation data.
The figures, covering the 12 months ending January 2026, show Delta transported 17 million passengers across its long-haul network, a 4% increase from the prior year. The carrier accounted for one in every eight long-haul passengers flown from the United States. Its average long-haul load factor — technically the seat factor — stood at 84.7%, a result 1.5 percentage points above its domestic network average.
A Near-Monopoly Route at the Top
The JFK-Prague seasonal route, operated daily using Boeing 767-300ER aircraft, carried 59,960 passengers at a 94.1% seat fill rate, the highest of any Delta long-haul service in the measured period.
The performance reflects a prolonged absence of competing service. Delta has operated the only U.S. nonstop to the Czech Republic since 2019, when American Airlines ended its Philadelphia service and United Airlines ceased its Newark operation. That exclusivity ends this month, as American returns to Prague from Philadelphia. Available capacity on the route has jumped 108% year-over-year, though total seats for sale on the corridor remain 40% below 2019 levels.
Atlanta Leads the Hub Rankings
Delta’s Hartsfield-Jackson Atlanta International Airport hub — the world’s busiest airport, serving more than 106 million passengers in 2025 — produced a long-haul load factor of 86.4%, higher than any of the carrier’s other U.S. gateways.
Atlanta to Lima, Peru ranked second overall at 91.1%, carrying 206,229 passengers. Delta deployed the 339-seat Airbus A350-900 — then its highest-capacity widebody aircraft — through October 2025, before switching to a lower-premium, 282-seat Airbus A330-300 on Oct. 25, 2025. All A350-900 frames configured to the 339-seat layout have been reconfigured or are undergoing that process.
Booking data show nearly eight in 10 Atlanta-Lima passengers connected through Atlanta or Lima or both. An estimated 40,000 travelers flew beyond Lima to further South American destinations, with the Denver-Cusco city pair recording the heaviest connecting volume. Delta holds a 10% equity stake in LATAM Airlines under a joint venture agreement.
Atlanta to Honolulu ranked third at 90.8%, carrying 193,603 passengers. Atlanta to Madrid followed at 90.5% (156,228 passengers) and New York-JFK to Madrid at 90.3% (170,951 passengers).
The Full Top 10
New York-JFK to Berlin ranked sixth at 90.2%, carrying 76,494 passengers. Orlando International Airport to Amsterdam’s Schiphol Airport followed at 90.1% (75,377 passengers) — service that operates daily in winter using Airbus A330-300 and A330-900neo aircraft through Delta’s SkyTeam partnership with KLM, and is Delta’s only international route from Orlando.
Atlanta to Amsterdam ranked eighth at 90.1%, carrying 487,148 passengers — the largest absolute passenger total of any route in the top 10. New York-JFK to Lisbon ranked ninth at 90.0% (166,708 passengers), and Atlanta to Athens closed out the list at 89.9% (157,996 passengers), operated with the A330-900neo.
Competition and the Transatlantic Arms Race
The near-capacity load factors arrive as the three major U.S. legacy carriers escalate their summer transatlantic competition. Delta is fielding its largest-ever European schedule for summer 2026, with more than 650 weekly flights to nearly 30 destinations. United Airlines, the largest transatlantic operator, serves more European cities than any other U.S. carrier. American Airlines is targeting secondary markets, adding new service to Budapest and re-entering Prague.
Delta CEO Ed Bastian has attributed the airline’s pricing strength to a divergence in U.S. consumer behavior, noting that spending power is concentrated “at the higher end of the curve.” The carrier intends to “retain any of the pricing strength” gained during the current period, Bastian has indicated, with pricing driven by capacity strategy and market demand rather than fuel costs alone.
Transatlantic routes remain Delta’s most profitable international segment. In the first quarter of 2026, the carrier’s international unit revenue grew 5%.
A Setback, Then a Strategy Shift
The strong year-end numbers do not represent a uniformly smooth run. In the third quarter of 2025, Delta President Glen Hauenstein described transatlantic performance as “clearly disappointing,” with revenues falling 2% despite a 5% increase in capacity. Hauenstein attributed the shortfall to a “spring swoon” in economy cabin demand — a drop linked to macroeconomic uncertainty driven by trade policy disruptions — and pledged Delta would be “much more aggressive” in filling seats earlier in the booking cycle.
Delta reported record operating revenue of $63.4 billion for fiscal year 2025, with a GAAP pre-tax profit of $6.2 billion.
Key Takeaways
- Delta carried 17 million long-haul passengers in the year ending January 2026, up 4%, with eight of its 10 most-loaded routes serving European cities at an average long-haul load factor of 84.7%.
- JFK-Prague led the network at 94.1%; American Airlines’ return to Prague this month pushes year-over-year capacity on that route up 108%.
- Atlanta’s Hartsfield-Jackson hub recorded a long-haul load factor of 86.4% — higher than any other Delta U.S. gateway — driven by routes to Lima, Madrid, Amsterdam, and Athens.
- Delta CEO Ed Bastian said the airline plans to retain pricing strength regardless of fuel cost movements, with international unit revenue rising 5% in Q1 2026.
- After a Q3 2025 “spring swoon” cut transatlantic revenue 2%, Delta finished FY 2025 with record operating revenue of $63.4 billion and a GAAP pre-tax profit of $6.2 billion.